DSNT426I ALL THREE DATA SETS ARE REQUIRED FOR OUTPUT

Explanation
 You specified one or more output data sets and
left one or more output data set fields blank.
 This message
is issued by the following panel: DSNTIPT

System action
 The panel is redisplayed and the cursor is placed
on the field in error.

User response
 You must specify all or none of the output data
set fields.  Leave blank all output data set fields if you do not
want the installation CLIST to edit any CLISTs or JCL.